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py/runtime: Allow multiple **args in a function call.

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This is a partial implementation of PEP 448 to allow multiple ** unpackings
when calling a function or method.

The compiler is modified to encode the argument as a None: obj key-value
pair (similar to how regular keyword arguments are encoded as str: obj
pairs).  The extra object that was pushed on the stack to hold a single **
unpacking object is no longer used and is removed.

The runtime is modified to decode this new format.

Signed-off-by: David Lechner <david@pybricks.com>
This commit is contained in:
David Lechner
2020-03-24 21:39:46 -05:00
committed by Damien George
parent bb70874111
commit 1e99d29f36
9 changed files with 121 additions and 82 deletions
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tests/basics/python34.py.exp
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@@ -8,7 +8,6 @@ SyntaxError
SyntaxError
SyntaxError
SyntaxError
SyntaxError
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IndexError('foo',)